001两数之和

class Solution {
        public:
            vector<int> twoSum(vector<int>& nums, int target) {
                vector<int> s;
                if(nums.size()==0&&target==0)
                    {
                    return s;
                    }
                for(int i=0; i<nums.size(); i++)
                    {
                        for(int j=i+1;j<nums.size();j++)
                            {
                                if(nums[i]+nums[j]==target)
                                {
                                s.push_back(i);
                                s.push_back(j);
                                return s;
                                }
                            }
                    }
                return s;
            }
    };